Sometimes spelled " hemping" is the act of driving to the worst part of town to look for the nearest drug dealer. Usually looking for hemp.
Dude 1: I wanna smoke some bud. Right fucking now!
Dude 2: Shit, let's go hempn
Or
Dude 1: damn, where's Alex, were supposed to be smokin right now.
Dude 2: Chill the fuck out, he's hempn. He'll be back in a bit.